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Topic: Yolk sac

Related Topics

Gestational sac

Blighted ovum

Fetal pole

Gestation

Transvaginal ultrasound

Miscarriage

Trophoblast

Dilation and extraction

Placenta

Embryo

Foetus

Uterus

Ovum

Dilation and curettage

Sphere

	immunology - system organs I
		In birds and other vertebrates that lay eggs the yolk sac is a very large structure compared to the size of the embryo because of course the embryo is isolated from the mother and unlike humans cannot obtain further nutrients from her.
		The yolk sac of a chicken lasts from day zero until after hatching and continues to be a source of blood cells throughout although its activity diminishes as the yolk reduces in size and the bone marrow develops to take over production of blood cells.
		While blood cell development in the yolk sac membrane was actually inside the blood vessels themselves, the blood cell development in the fetal liver occurs outside of the blood vessel walls.
	www.keratin.com /am/am013.shtml (1366 words)

	Tiger: Raggin' & Rantin': Making Kang A Roo
		When the foetal membranes, such as the embryonic yolk sac or allantois, are applied to the uterine wall the structure formed is referred to as the placenta.
		The vascular part of the yolk sac placenta seems to be largely involved in respiratory gas exchange and it expands quickly in the later stages of gestation when the metabolic rate of the foetus also rises.
		The non-vascular part of the yolk sac is concerned with the transfer of nutrients and the building blocks for growth, such as proteins.
	tig.mu.nu /archives/009152.html (359 words)

	Multilineage hematopoietic progenitor activity generated autonomously in the mouse yolk sac: analysis using ...
		ABSTRACT The capacity of the yolk sac to generate multilineage, adult-type hematopoiesis was investigated in vivo using vascular endothelial-cadherin deficient embryos.
		In these mutants, the yolk sac is not connected to the vasculature of the embryo and therefore all hematopoietic activity detected therein is intrinsic to the yolk sac and not derived from intraembryonic sources.
		The small number of definitive mature blood cells indicates however that the yolk sac is not an effective environment for the terminal differentiation of committed progenitors from the second wave of hematopoiesis.
	www.ijdb.ehu.es /abstract.0304/a273.htm (246 words)

	Yolk Sac And Molar Pregnancy (Site not responding. Last check: 2007-10-30)
		Yolk Sac: The yolk sac is the first...
		Within the gestational sac a “yolk sac” is the initial sign of...
		two yolk sacs are seen within a single gestational sac, it could be a remnant from a twin pregnancy in which...
	www.best-in-dental-care.com /OPG/yolk-sac-and-molar-pregnancy.html (614 words)

	Case Reports
		Yolk sac tumor (endodermal sinus tumor) is the most common malignant germ cell tumor found in the pediatric age group(2).
		Elevation of alpha-fetoprotein (AFP) occurs with yolk sac tumors, since the fetal yolk sac is the source of physiological AFP in early embryogenesis.
		Yolk sac tumor, embryonal carcinoma, choriocarcinoma and combined nonteratomatous germ cell tumors of the mediastinum_A clinicopathologic and immunohistochemical study of 64 cases.
	www.indianpediatrics.net /dec-99/99-dec-10.htm (1082 words)

	Yolk Sac Tumors
		When yolk sac tumors develop in adults, however, they are more dangerous, especially if they are "pure" (that is, they do not contain other types of...
		Yolk sac tumours are members of the germ cell tumour group of ovarian neoplasms.
		Almost all ovarian yolk sac tumours occur in women under the age of 30.
	www.cancer-help.org /news/cancers/Yolk_Sac_Tumors.html (284 words)

	Yolk Sac Tumor of the Testis
		Testicular yolk sac tumor (YST) of infants is biologically distinct from its adult counterpart.
		Yolk sac tumor (YST) of prepubertal testis is a peculiar neoplasm with overall good prognosis.
		Yolk sac tumors and/or teratomas occurred in the children, whereas mixed histologies, including embryonal carcinoma, were predominant in the adolescents.
	www.thedoctorsdoctor.com /diseases/yolksactumor_testis.htm (2052 words)

	[No title]
		We are concerned about a "splitting of the yolk sac" as we had a baby developing at 5 1/2 weeks and then a week or so later, yoke sac was smaller and no heart beat was detected.
		Inside the gestational sac at the time of your scan, should have been a fetal pole and a yolk sac.
		The yolk sac is a tiny circle a few millimeters across which eventually becomes a part of the fetus in the second trimester.
	www.pregnancy.org /article.php?sid=1103 (485 words)

	Animal Sciences Research and Reviews, Special Circular 156, Fatty Acid-Binding Protein in the Developing Turkey Embry
		Concentrations in the yolk sac membrane correlated well with the period of maximum lipid transfer from the yolk to the developing embryo via the yolk sac membrane.
		The largest proportion of yolk lipids mobilized from the yolk sac to the embryo occurs during the last week of incubation (Ding et al., 1995; Ding and Lilburn, 1996).
		This is the period during which yolk lipids are extensively mobilized and transferred from the yolk to the developing embryo (Ding and Lilburn, 1996).
	ohioline.osu.edu /sc156/sc156_34.html (1468 words)

	NDI Terminology - yolk sac (Site not responding. Last check: 2007-10-30)
		The extraembryonic membrane that connects with the midgut; at the end of the fourth week of development it expands into the pear-shaped umbilical vesicle connected to the body of the embryo by the long narrow yolk stalk.
		In marsupial and placental mammals, it produces a complete vitelline circulation in the early embryo and then undergoes regression; in oviparous vertebrates, it encloses the yolk mass, breaks down yolk, and makes it available to the developing organism.
		In human embryos it does not serve a primary nutritive function, but it is the first hematopoietic organ of the embryo.
	www.ndif.org /Terms/yolk_sac.html (96 words)

	Transcription Factor GATA-4 Is Expressed in Pediatric Yolk Sac Tumors -- Siltanen et al. 155 (6): 1823 -- American ...
		Yolk sac tumors (YSTs) are malignant tumors that occur in the
		GATA-4 and stain the nucleus of murine yolk sac endoderm, cardiomyocytes,
		Immunohistochemistry for GATA-4 and AFP in pediatric yolk sac tumors.
	ajp.amjpathol.org /cgi/content/full/155/6/1823 (2931 words)

	Yolk sac
		The yolk sac is the first element seen in the gestational sac during pregnancy, usually at 5 weeks gestation.
		When Yolk Sac in small sac is seen (< 13 mm.), and particularly when heartbeat is seen in larger sacs, expectant management will identify a substantial majority of successful...
		Related: yolk sac :: yolk sac tumor :: yolk sack :: yolk sac pregnancy :: yolk sac ultrasound :: yolk sac carcinoma :: yolk sac in pregnancy :: yolk sac size :: yolk sac tumour :: yolk sac fetal pole
	www.logicjungle.com /wiki/Yolk_sac (279 words)

	irregular yolk sac
		I have had 2 miscarriages in the last 11 months, one at 11 weeks was a blighted ovum and the second one at 8 weeks,five hours after an u/s with a beating heart.
		I just went to the dr.(a different practice - more aggressive) on 2/19 and again we have a beating heart, but the doctor said my yolk sac was shaped irregularly and had some echos in it.
		This is a worrisome sign to sonography physicians who support the internet statistic that you cite: a large proportion of pregnancies with this observation do poorly.
	www.medhelp.org /forums/maternal/archive/2781.html (256 words)

	Amniote Egg
		Inside the egg are a series of fluid-filled membranes which permit the embryo to survive: the amnion, allantois, yolk sac, and chorion.
		The allantois and yolk are attached to the reptile embryo.
		The allantois and yolk sac become the umbilical cord, providing a connection through which food reaches the fetus, and wastes are removed.
	www.biologycorner.com /worksheets/amniote-egg.html (487 words)

	Pregnancy week by week - pregnancy calendar - pregnancy stages trimesters - pregnancy websites - motherhood maternity - ...
		In the meantime, the yolk sac provides some nourishment and is eventually reabsorbed into your baby's body to form their bowel, liver, lungs and bladder.
		The yolk sac is also where the baby will start producing their own blood supply.
		A tiny sac can be seen, but the baby and their heart beat are not able to be detected yet.
	www.birth.com.au /class.asp?class=6634&page=6 (373 words)

	FINE-NEEDLE ASPIRATION BIOPSY (FNAB) DIAGNOSIS OF
		Photomicrograph of a yolk sac tumor in which small deposits of eosinophilic basement membrane-like material are also noted (hematoxylin and eosin stain, 150x).
		Photomicrograph showing a yolk sac carcinoma, in which some of the cells contain eosinophilic inclusion bodies within the cytoplasm (hematoxylin and eosin stain, 150x).
		Demonstration of fibrils in the hyaline globules of yolk sac tumor with parietal differentiation in fine-needle aspiration smears.
	www.kfshrc.edu.sa /annals/174/96-110.html (3306 words)

	Babies!
		The turtles which emerged with full yolk sacs were wrapped in moist tissues until the yolk sacs had a change to be absorbed into the bodies a bit more.
		The yolk sac (below right) is yellow with blood vessels running through it, the darker sacs include the amniotic and chorionic sacs, which are used in respiration, and the allantois, where waste is stored.
		The yolk sac gets smaller as the nutrition in it is absorbed into the body, and the extra membranes (reddish in the photo to the left) drop off.
	www.marietta.edu /~mcshaffd/boxt/babies.html (1183 words)

	[No title]
		Visualization of the yolk sac/embryo complex is diagnostic of an intrauterine pregnancy and excludes blighted ovum.
		The yolk sac should always be seen with TVS when the gestational sac reaches a mean diameter of 8 mm at 5 to 6 week.
		In summary, when the mean gestational sac diameter is less than 20 mm or the crown rump length is less than 5 mm, an examination should be repeated at least one week later to determine the presence of fetal heart activity as well as growth of the gestational sac.
	hkcog.obg.cuhk.edu.hk /docs/college_guidelines/Guidelines_for_First_Trimester_Ultrasound_Exam_Part1_2004.txt (2227 words)

	Evidence That Insulin is Imprinted in the Human Yolk Sac -- Moore et al. 50 (1): 199 -- Diabetes
		Ins2 (the mouse ortholog of INS) is imprinted in the yolk sac
		INS expression was detected in 16 of the 38 yolk sacs and expression
		extracelomic cavity and the secondary yolk sac (15).
	diabetes.diabetesjournals.org /cgi/content/full/50/1/199 (3155 words)

	Guardian Unlimited \| Life \| How did that boy end up with his twin growing inside him?
		One of the earliest places that germ cells - which go on to produce the testicles and the ovaries - develop is the yolk sac attached to the embryo.
		As the embryo develops further, the yolk sac is normally drawn back into the foetus.
		In the case of the foetus in foetu, the healthy baby would draw in what is left of its twin with its yolk sac.
	www.guardian.co.uk /life/thisweek/story/0,12977,999292,00.html (596 words)

	Nigerian Veterinary Journal - Vol. 23, No. 2 (2002)
		A case of yolk sac infection is reported among 500 broiler chicks bought for National Root Crop Research Institute, Umudike, Poultry Project.
		The striking feature was an inflamed unabsorbed yolk sac with the yolk abnormal in colour and consistency.
		The outbreak was presumed to be as a result of Escherichia coli contaminating the hatching eggs and further penetrate the shell to infect the yolk.
	www.ajol.info /viewarticle.php?jid=19&id=7926&OJSSID=fb15da17612d6108fdc5545b6a45e9d9 (227 words)

	Blue Mountain Ostrich Feeds : Yellow-Livered Ostrich Chick Study (Site not responding. Last check: 2007-10-30)
		Since the yolk sac is high in fats, it is imperative that bile gets to the yolk sac so the nutrients can be properly absorbed into the digestive system.
		This photo also shows a yolk sac that is being properly absorbed for a chick that is 8 days of age as this one.
		With the yolk sac being laid out on a table, the top 1/3 of the yolk sac was strewn with green bile while the bottom 2/3's of the yolk sac was still yellow.
	www.blue-mountain.net /feed/p0002065.htm (828 words)

	An emergency omphalectomy (egg yolk/yolk sac removal) procedure in an Emys (Emydoidea) blandingii (Blanding's ...
		The basis for this emergency procedure is to rapidly extricate the yolk sac from the coelomic cavity WITHOUT tearing it.
		A torn yolk sac can result in allowing yolk, a fertile growth medium for bacteria, to escape into the animal's body cavity.
		The longer the contaminated yolk sac and it's associated blood supply are pumping through the neonate, the greater the chances for sepsis and subsequent death so thus the need for speed yet precision.
	www.chelonia.org /Articles/Omphalectomy.htm (411 words)

	Elasmobranch Reproductive Modes
		Extended Oviparity – also termed “single oviparity”; paired eggs are laid, one from each oviduct; embryos derive nourishment solely from yolk in external yolk sac and undergo most of their development outside the mother’s body; the egg membrane is sclerotinized to form a collagenous, sulphur-rich case that often has antifouling properties.
		Matritrophic Viviparity with Oophagy – embryos feed initially on yolk in external yolk sac; after yolk sac is absorbed, embryos feed on unfertilised ova produced and shed by their mother.
		Matritrophic Viviparity with Oophagy and Histotroph – embryos feed initially on yolk in external yolksac, then unfertilised ova produced and shed by their mother, these ova are consumed by embryos to replenish the external yolk sac; vilified embryonic surfaces indicate absorption of histotroph (“uterine milk”).
	www.elasmo-research.org /education/topics/lh_rep_modes.htm (431 words)

	Uusi sivu 1
		The yolk sac in rodents plays a vital role in nutrition prior to formation of the placenta.
		The yolk sac is also the origin of germ cells, the precursors for gametes.
		We have studied GATA-6 expression in later stage mouse yolk sac and pediatric GCTs by immunohistochemistry and in situ hybridization.
	www.kll.helsinki.fi /osastot/personal/lastenja/LNK_sivut/Abstracts%2002/Siltanen.htm (632 words)

	Yolk Sac Tumor \| Webpathology.cfm (Site not responding. Last check: 2007-10-30)
		Remarks: Schiller-Duvall body is a structure seen in the endodermal sinus pattern of yolk sac tumor.
		Remarks: The solid pattern of yolk sac tumor consists of sheets of uniform tumor cells with clear or pale pink cytoplasm.
		It may be confused with seminoma; however, it lacks the fibrous septa with lymphoid infiltrate seen in seminoma.
	www.webpathology.com /case.cfm?case=34 (291 words)

	Hyperglycemia-Induced Vasculopathy in the Murine Conceptus Is Mediated via Reductions of VEGF-A Expression and VEGF ...
		Histochemical analysis of 5-µm sections of yolk sacs from 8.5 (a and b) and 9.5 (d and e) dpc.
		This abnormal yolk sac vasculature was characterized by the presence
		In contrast, the yolk sacs of the hyperglycemia-exposed
	ajp.amjpathol.org /cgi/content/full/158/4/1199 (4657 words)

	BioMed Central \| Full text \| Reduced-folate carrier (RFC) is expressed in placenta and yolk sac, as well as in cells of ...
		RFC message was expressed also in the trophoblastic giant cells, labyrinth, junctional zone, yolk sac and within the neural tube of the developing embryo (Figure 1A and 1C).
		Immunofluorescence showed that RFC protein was present widely throughout the placenta with particularly intense expression in the trophoblastic giant cells, the yolk sac and within the neural tube of the developing embryo (Figure 1B and 1D).
		While RFC expression is most strongly present in specialized cell-types in adult mice, during development RFC mRNA and protein are expressed in the placenta, yolk sac and throughout the embryo, with higher levels of expression being confined to cell populations in the neural tube, forebrain, hindbrain, craniofacial region, eye, limb buds, heart, somites and tail.
	www.biomedcentral.com /1471-213X/3/6 (2693 words)

	BioMed Central \| Abstract \| Reduced-folate carrier (RFC) is expressed in placenta and yolk sac, as well as in cells of ...
		In the mouse, RFC transcripts and protein are expressed in the E10.0 placenta and yolk sac.
		In the E9.0 to E11.5 mouse embryo RFC is widely detectable, with intense signal localized to cell populations in the neural tube, craniofacial region, limb buds and heart.
		The present work demonstrates that RFC is present in placenta and yolk sac and provides the first evidence that it is expressed in the neural tube, craniofacial region, limb buds and heart during organogenesis.
	www.biomedcentral.com /1471-213X/3/6/abstract (436 words)

	Cockatiel Assist Hatch 2
		This was towards where the air sac would be in the shell at the rounder portion.
		If there was blood I would have used a little flour to try to stop the bleeding and would have stopped for a little while while staying with the chick and keeping it warm with a heat source.
		His right wing is in the proper position for pipping and another sign the yolk sac may have been absorbed.
	www.loveofbirds.com /photoinfo/MSAssisthatch1.htm (710 words)

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